Discussion Overview
The discussion revolves around the search for a schematic diagram for the Tenma 705-72 DC laboratory power supply, focusing on troubleshooting issues with one of its channels that outputs maximum voltage. Participants explore potential solutions and resources related to the power supply's design and components.
Discussion Character
- Technical explanation
- Debate/contested
Main Points Raised
- One participant requests a legible schematic diagram for the Tenma 705-72 power supply, noting issues with one channel outputting maximum voltage.
- Another participant suggests starting with the data sheets for the LM723 regulators, indicating that the design should adhere to recommended application data.
- It is noted that the two channels of the power supply are almost identical, which could aid in troubleshooting.
- A participant advises inspecting for burned parts and replacing both the LM723 and the 2N3055 transistors, suggesting that a failure in the 2N3055 could have affected the LM723.
- A later reply mentions a past reference to MCM Electronics providing a schematic and notes that MCM is now owned by Newark, which sells the Tenma product line.
Areas of Agreement / Disagreement
Participants present various suggestions for troubleshooting and sourcing information, but there is no consensus on a definitive solution or schematic availability.
Contextual Notes
Participants express uncertainty about the specific failure in the power supply and the reliability of the referenced schematic source.
Who May Find This Useful
Individuals interested in repairing or understanding the Tenma 705-72 DC power supply, as well as those looking for resources on LM723 regulators and 2N3055 transistors.
